Poly(lactic acid)/Aluminum Oxide Composites Fabricated by Sol‐Gel and Melt Compounding Processes

Abstract

Aluminum‐oxide‐coated PLA pellets, particles derived from aluminum oxide sol‐gel, and calcinated α‐Al2O3 powders were used to fabricate PLA/AlOx composites. The formation of aluminum oxide was confirmed by FTIR and EDS. SEM images suggested the melt compounding system provided a fairly homogeneous dispersion of AlOx particles in the PLA matrix. XRD analysis showed PLA and PLA/AlOx composites were both amorphous. The incorporation of AlOx particles did not alter the melting temperature of PLA. However, the shape and intensity of the melting endotherms was significantly changed, suggesting bimodal melting behavior. UV‐Vis transmission spectra suggested that PLA/AlOx composites may act as a better UV barrier than neat PLA.magnified image

Poly(L‐lactic acid) metal organic framework composites: optical, thermal and mechanical properties

“…As the percentage of MOF increased, the cold crystallization shifted to lower temperatures ( T c = 115.0 ± 0.8 °C for PLLA–5MOF) showing a nucleating effect. The same effect has been reported upon compounding PLLA with zeolites 12. The compression molded films, which were subjected to two thermal cycles, exhibited bimodal melting peaks for the PLLA–MOF composites (Fig.…”

“…The weight‐average molecular weight ( M w ) of the PLLA resin and the extruded samples was determined by using a gel permeation chromatograph (GPC) equipped with a Waters 1515 isocratic pump, a Waters 717 autosampler, a series of Waters Styragel columns (HR4, HR3 and HR2) and a Waters 2414 refractive index detector interface with Water Breeze software (Waters Inc., Milford, MA, USA). Additional details of the methodology can be found elsewhere 12…”

“…The morphology of the MOF powders and impact fracture surfaces of PLLA and PLLA–MOF were observed using a JEOL JSM‐6400 (JEOL Ltd, Tokyo, Japan) SEM equipped with an LaB 6 gun and obtained as described elsewhere 12…”

“…Compounding of PLA with reinforced and functional particles has been the subject of continuous research to produce biodegradable functional membranes for technical applications such as medical, packaging and environmental remediation 11–13. To the best of the authors' knowledge, compounding of MOFs with PLA has been scarcely reported 14.…”

Enhanced Mechanical Stability and Biodegradability of Ti-Infiltrated Polylactide

“…Various approaches such as copolymerization, blending, and compositing have been so far proposed to improve the mechanical performance of the PLA. − Among them, the incorporation of the reinforcement materials into the PLA is known to pronouncedly improve the mechanical properties, such as tensile strengths of the resulting composites. , Several organic and inorganic additives, such as cellulose, silica, alumina, calcium carbonate, starch, − and carbon nanotubes, have been employed to enhance the mechanical performance of the PLA. However, many resulting PLA-based composites show changes in biodegradable and renewable nature simultaneously, although the mechanical performance of those composites is improved.…”